Adding Jank test harness around GLReferenceBenchmark.

Currently the timestamps are just logged to logcat, later on they will
be analysed, the reason for not doing it now is to keep the size of this
CL down.

Change-Id: I00efbe4f766fe3dc3866ca9bf36f77db84b8a9bd
diff --git a/build/test_uiautomator.mk b/build/test_uiautomator.mk
index 255f70b..c17f12b 100644
--- a/build/test_uiautomator.mk
+++ b/build/test_uiautomator.mk
@@ -17,6 +17,8 @@
 # package XML needed by CTS.
 #
 
+LOCAL_DEX_PREOPT := false
+
 include $(BUILD_JAVA_LIBRARY)
 
 cts_library_xml := $(CTS_TESTCASES_OUT)/$(LOCAL_MODULE).xml